8.2.2.3 Phantom Power
To supply a connected condenser microphone, Phantom Power (48V) can be applied to both analog
inputs. To do so, click on the
Phantom Power
button.
Note: Before activating the 48V Phantom Power, check whether the connected microphone is designed
for this mode. If a signal source with line level is added, no Phantom Power must be applied to the
input normally.
WARNING: In the case of a mismatch/misadjustment your microphone or other signal source may be
damaged.
8.2.3 Module:
Subsonic
This is a tool for attenuating low-frequency noise and interferences efficiently.
The Subsonic filter is a powerful adjustable high-pass filter with a slope of 18dB/ octave.
The control range for the corner frequency (-3 dB point) is 30 to 200 Hz.
The filter always operates on a maximum attenuation below the corner frequency; thus, gain setting is
not available.
In particular in the editing of speech, the Subsonic filter is an important tool for the elimination of
interferences. It can be caused by the speaker (e.g. so-called “plops” during the pronunciation of the
consonant “P”) or they enter the microphone from the speaker environment (e.g. as subsonic noise or
parasitic noise from an air conditioning system).
However, the Subsonic filter can also excellently be used for a creative sound editing, e.g. in
interaction with a low-frequency gain setting in one of the EQ-modules.
8.2.4 Module:
Phase
This function is a special type within the Audio Processing module since its effect cannot be heard
immediately, but has a more technical background.
The function improves the input level range of an A/D converter or digital processing stages following
this module.
If you are not sure whether or not to activate this function, you should leave the module deactivated.
Technical background:
The Phase module generates an effect known in the broadcast range as a
“phase rotation” which is to prevent a clipping by asymmetric signal amplitudes. Just the human voice
can provide an unsymmetrical signal amplitude in many cases. This may e.g. reduce the input level
range of a converter so that early distortions may occur. To counteract this effect, the phase module
sets an all-pass filter into the signal path to stabilize a signal symmetrically. From a technical point of
view, the DC-portion is taken from the signal.
In effect, a signal can be leveled higher without being distorted, i.e. the Phase module enhances the
“loudness” of the signal.
The Phase function has no parameters which can be edited, and thus no special setting window. It
can only be switched on and off.
Note: The Phase module does
not
include a Phase Reverse function, i.e. a reversal of the polarity of
the audio signal as known from the input stage of audio-mixing desks.
VIP
digital
Manual 4.0 Yellowtec 2004 Rev. 26.07.2004
Page 44
